Chap 9 water and state changes theng

Question 1

at what temp does boiling happen (water)

Answer 1

100°C

Question 2

a enclosed box has 100 cm3 of air in it. you press 100 more inside. How much cm3 of air is inside and why

Answer 2

100 cm3 as it does not have a fixed volume and it can be compressed

Question 3

why does crushed ice help make smth cold faster compared to normal ice cubes

Answer 3

crushed ice has an increased surface/contact area with the item and thus be able to cool down the thing faster than a singular ice of the same volume

Question 4

states of water

Answer 4

solid liquid gas

Question 5

properties of solid

Answer 5

fixed volume, fixed shape, cannot be compressed

Question 6

properties of water

Answer 6

fixed volume, does not have fixed shape, cannot be compressed

Question 7

properties of gas

Answer 7

does of have fixed volume, does not have fixed shape, can be compressed

Question 8

melting gain/lose heat

Answer 8

gain

Question 9

freezing gain/lose heat

Answer 9

lose

Question 10

during evaporation gain/lose heat

Answer 10

gain

Question 11

during condensation gain/lose heat

Answer 11

lose

Question 12

whats the freezing point

Answer 12

0°C

Question 13

whats the melting point

Answer 13

0°C

Question 14

Since the temperature of ice remains as 0°C when it melts, it is not gaining heat . true or false eplain

Answer 14

false. when ice melts, it is gaining heat however the heat is used to help the particles in ice to break away from one another thus the temperature of melting ice remains as 0°C until all ice has turned into water